The three concepts of case, valency and transitivity belong to the most discussed topics of modern linguistics. On the one hand, they are crucially connected with morphological aspects of the clause, including case marking, person agreement and voice. On the other hand, they are related to several semantic issues such as the meaning of case, semantico-syntactic verbal classes, and the semantic correlates of transitivity. The volume unifies papers written within different theoretical frameworks and representing variegated approaches (Optimality Theory, Government and Binding, various versions of the Functional approach, Cross-linguistic and Typological analyses), containing both numerous new findings in individual languages and valuable observations and generalizations related to case, valency and transitivity.